Porous CuF 2 integrated with a three-dimensional conductive network of CNTs as cathode materials for lithium-ion batteries

In this study, a hybrid nanostructure composed of porous CuF 2 and a three-dimensional (3D) electronic network of CNTs has been successfully fabricated by a precipitation method and a following solid-state reaction process as cathode material for lithium-ion batteries. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) results demonstrate the intimate contract of CuF 2 particles and the reserve of the porous structure after the addition of CNTs. Inherited the advantage of porous structure and the three-dimensional (3D) conductive network of CNTs, the CNTs/porous CuF 2 composite exhibits enhanced electrochemical performance than porous CuF 2 , where the initial discharge capacity increases from 531 to 618 mAh g −1 at 0.1C. Moreover, electrochemical impedance spectroscopy (EIS) and galvanostatic intermittent titration technique (GITT) results demonstrate the decrease of the charge-transfer resistance and the promotion of the Li + diffusion in virtue of CNTs. The hybrid nanostructure proposed in this work may be potentially used in other transition metal fluorides as cathode materials for lithium-ion batteries with high energy densities.